"Disable SMTP (sending)" option from ispconfig control panel

the (very useful) function of Disable SMTP (sending) for a certain mailbox it's look like that works on certain sysop, and not in others.
For example we have a multiserver setup with servers with the following sysop:

(your server_id's may be different). So make sure the two servers which aren't working do have that query (or similar, I'm not sure how ispconfig 3.0.5 would vary) setup, and then make sure the mail_forwarding table has a 'disablesmtp' column which isn't set to 'n' for those users.